Difference between UHF,HF,RF and MF induction heaters

Type	UHF(Ultra-high Frequency)	HF(High Frequency)	RF(Radio Frequency)	MF(Medium Frequency)
Frequency	>=100 KHz	30KHz~100KHz	20KHz~80KHz	5KHz~20KHz
Based	IGBT or MOSFET or SiC	IGBT	IGBT	IGBT or SCR
Cooled Type	Water	Water or Air	Water or Air	Water or Air
Application Description	Ultra-high frequency induction heaters are often used for quenching or hardening work, higher output frequency will bring thinner hardening depth and faster heating speed (some applications need 0.1mm~2mm hardening depth, then only ultra-high frequency machines can satisfy these works).	High frequency induction heaters are often used for brazing, jointing , normal quenching or small forging work.	Radio frequency induction heaters are often used for hardening, brazing, welding , normal quenching, forging and forging work.	Medium frequency induction heaters are often used for forging or melting or big depth quenching work.
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